Basketball isn't all about the boxscore numbers. Gibson is a very good defensive player.

I would say a very solid defensive player in a very good defensive system. Offensively has his ways to go, and doesn't have that potential Demar or any of the top 5 guys have. Drafting in the lottery is usually a combination of best player available (or potential), need, and NBA readiness. Gibson in the draft would have only fit 1 of those. Need.

Derozan would fill best player available going sorely based on potential, need because there were 2-3 teams in the top 5 needing a shooting guard, but came into the league raw. But, his athleticism allowed him to contribute in a number of ways (defend passing lanes, penetration, athletic runner).

Boxscore/stats don't tell the story, but they also don't lie. There's a reason why you account for stats, and the wins.